How do I deal with the error: The remote server returned an error: (500) Internal Server Error. ? Wh

[EDN Admin]

How do I deal with the error: The remote server returned an error: (500) Internal Server Error. ? When downloading web page source
Error: The remote server returned an error: (500) Internal Server Error.

Sometimes the page source request fails and I get the above error, how do I check for this error prior to asking for webpage source and if error found skip downloading current page source?

Code:
Dim presentlink As String = String.Empty
Dim Mylinks As List(Of String) = New List(Of String)
For i = 0 To Mylinks.Count - 1
presentlink = ((New Net.WebClient).DownloadString(Mylinks(i)))
If presentlink.Contains("This is the one Im looking for") Then
msgbox(mylinks(i))
End If
Next

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